BioChemistry > QUESTIONS & ANSWERS > Chapter 4 The Three-Dimensional Structure of Proteins. Correct answers provided. (All)

Chapter 4 The Three-Dimensional Structure of Proteins. Correct answers provided.

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Multiple Choice Questions 1. Overview of protein structure Pages: 114115 Difficulty: 1 Ans: D All of the following are considered “weak” interactions in proteins, except: A) hydrogen bonds. B) hydrophobic interacti ...

Multiple Choice Questions 1. Overview of protein structure Pages: 114115 Difficulty: 1 Ans: D All of the following are considered “weak” interactions in proteins, except: A) hydrogen bonds. B) hydrophobic interactions. C) ionic bonds. D) peptide bonds. E) van der Waals forces. 2. Overview of protein structure Pages: 114115 Difficulty: 2 Ans: A The most important contribution to the stability of a protein’s conformation appears to be the: A) entropy increase from the decrease in ordered water molecules forming a solvent shell around it. B) maximum entropy increase from ionic interactions between the ionized amino acids in a protein. C) sum of free energies of formation of many weak interactions among the hundreds of amino acids in a protein. D) sum of free energies of formation of many weak interactions between its polar amino acids and surrounding water. E) stabilizing effect of hydrogen bonding between the carbonyl group of one peptide bond and the amino group of another. 3. Overview of protein structure Page: 115 Difficulty: 1 Ans: D In an aqueous solution, protein conformation is determined by two major factors. One is the formation of the maximum number of hydrogen bonds. The other is the: A) formation of the maximum number of hydrophilic interactions. B) maximization of ionic interactions. C) minimization of entropy by the formation of a water solvent shell around the protein. D) placement of hydrophobic amino acid residues within the interior of the protein. E) placement of polar amino acid residues around the exterior of the protein. 4. Overview of protein structure Page: 115 Difficulty: 2 Ans: B Pauling and Corey’s studies of the peptide bond showed that: A) at pH 7, many different peptide bond conformations are equally probable. B) peptide bonds are essentially planar, with no rotation about the C—N axis. C) peptide bonds in proteins are unusual, and unlike those in small model compounds. D) peptide bond structure is extraordinarily complex. E) primary structure of all proteins is similar, although the secondary and tertiary structure may differ greatly. 38

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